@article{RESEARCH,
      recid = {66668},
      author = {Thongmalai, P and Rakha, M and Ramasamy, S and Hwang, S-Y},
      title = {Development of molecular markers associated with tomato  fruitworm (Helicoverpa armigera Hübner) resistance  components in wild tomato (Solanum pimpinellifolium L.)},
      publisher = {World Vegetable Center},
      address = {Shanhua, Tainan, Taiwan. 2018},
      number = {RESEARCH},
      abstract = {Tomato fruitworm (Helicoverpa armigera Hübner) is a major  production constraint to cultivated tomato (Solanum  lycopersicum L.) in the tropics and subtropics. Developing  pest-resistant cultivars would be an alternative control  approach, and contribute to a reduction in the misuse of  chemical pesticides in tomato production. Here, molecular  markers, glandular trichomes and acylsugars associated with  tomato fruitworm resistance were investigated. A total of  200 F2 plants derived from the interspecific hybridization  between WorldVeg breeding lines S. lycopersicum CLN3682C  and S. pimpinellifolium VI030462 were genotyped using 8  putative resistance loci previously identified for whitefly  resistance on chromosomes 3, 5, 6, 7, 9 and 11. The same  plants, along with resistant and susceptible parents, their  F1, and susceptible check tomato line, were bioassayed for  larval mortality, larval weight, pupal duration, and egg  number using a no-choice test at 7 and 13 weeks after  sowing. The results show that the mortality rate of larvae  feeding on F2 populations for 10 days positively correlated  with density of type IV trichomes in 7-week-old plants.  Type IV trichomes and acylsugar production showed recessive  gene action, because the F1 was skewed strongly toward the  susceptible parent. A total of 12, 2, 3, 1 and 9 CAPS  markers in 4 regions were significantly associated with the  density of type IV trichomes, larval mortality, pupal  duration, larval weight and acylsugars, respectively. More  studies are underway to confirm these markers in F3 and  BC1F2 populations, which would be very useful for  marker-assisted selection in our breeding program for  insect resistance.},
      url = {http://worldveg.tind.io/record/66668},
}